What is the time difference between Sydney and Honolulu?

Honolulu is 20 hours behind Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Honolulu from Sydney?

Between 10:00–14:00 in Sydney, which is 14:00–18:00 in Honolulu. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Sydney observe daylight saving time?

Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.

Does Honolulu observe daylight saving time?

No. Honolulu stays on UTC-10 all year, so its clocks never move.

If it is midday in Sydney, what time is it in Honolulu?

It is 16:00 in Honolulu, still on the previous day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Sydney and Honolulu use?

Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Honolulu uses Pacific/Honolulu, currently UTC-10 (HST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Sydney time to Honolulu time

Honolulu is 20 hours behind Sydney right now, so midday in Sydney lands in the afternoon in Honolulu.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Sydney, across for Honolulu.

Sydney	Honolulu
00:00	04:00previous day
01:00	05:00previous day
02:00	06:00previous day
03:00	07:00previous day
04:00	08:00previous day
05:00	09:00previous day
06:00	10:00previous day
07:00	11:00previous day
08:00	12:00previous day
09:00	13:00previous day
10:00	14:00previous day
11:00	15:00previous day
12:00	16:00previous day
13:00	17:00previous day
14:00	18:00previous day
15:00	19:00previous day
16:00	20:00previous day
17:00	21:00previous day
18:00	22:00previous day
19:00	23:00previous day
20:00	00:00
21:00	01:00
22:00	02:00
23:00	03:00

Daylight saving time

Honolulu keeps one offset all year while Sydney moves twice. That is the whole reason this difference is seasonal.

Sydney

Observes daylight saving time

Standard: UTC+10
Daylight: UTC+11
Next change: 2026-10-04 +60m

Honolulu

Does not observe daylight saving time

Standard: UTC-10

When you can actually talk

The window is 4 hours wide — 10:00–14:00 in Sydney, 14:00–18:00 in Honolulu.

Sydney 10:00–14:00Honolulu 14:00–18:00
Sydney 09:00–10:00Honolulu 13:00–14:00

Reference

The zone identifiers and offsets behind everything above.

	Sydney	Honolulu
IANA zone	Australia/Sydney	Pacific/Honolulu
Abbreviation	AEST	HST
Standard offset	UTC+10	UTC-10
Daylight offset	UTC+11	—
Clock changes this year	2	0
Country	Australia	United States

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Sydney and Honolulu?: Honolulu is 20 hours behind Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Honolulu from Sydney?: Between 10:00–14:00 in Sydney, which is 14:00–18:00 in Honolulu. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Sydney observe daylight saving time?: Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.
Does Honolulu observe daylight saving time?: No. Honolulu stays on UTC-10 all year, so its clocks never move.
If it is midday in Sydney, what time is it in Honolulu?: It is 16:00 in Honolulu, still on the previous day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Sydney and Honolulu use?: Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Honolulu uses Pacific/Honolulu, currently UTC-10 (HST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.